Hi Jim,
Interesting on the system, How are you driving it ?
As for 'tests' well , what's the audio bandwidth of you system ? , looks
like most modes are in multipsk , but for rtty at 85 hz shift , mmtty has
that option
Problem is the propagation , the window is not very long, but psk31 looks to
do a good job , and ive run a session using Olivia 16 tones @ 250 Hz bw ,
that looked to get the best reception reports , only thing is its 250 hz
wide , I noticed that multi psk has a 110 baud hf packet mode , its no wider
than olivia , would be interesting to see if it would manage a qso , using
very short frames , might just get in during the qsb peaks , ?
To date, Its proved very hard to have a qso via data , mainly due to qsb ,
any system that requires to 'lock' first gives poor results ..
Graham ..
----- Original Message -----
From: "James Moritz" <[email protected]>
To: <[email protected]>
Sent: Wednesday, October 31, 2007 6:03 PM
Subject: Re: LF: EER Transverter and Linear Modes testing
Dear Gary, Graham, LF Group
Thanks for the screen shots of the Chirped Hell sigs. The "speed" used
during the tests was intended to be viewed with the same spectrogram
settings as QRSS 3
I will be out this evening, but will try some more tests tomorrow. I have
PSK31 working on my shack PC at the moment, plus I have downloaded some
RTTY
software which will hopefully be working by then. I'm open to suggestions
as
to what sort of tests to do.
BTW Graham - for your preset pots, Farnell part number 452 610 looks like
the right thing.
Cheers, Jim Moritz
73 de M0BMU
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